Camera (EOS 7D MkII) is C
Ext Tube (EF12 MkI) is 12R
Ext Tube (EF12 MkII) is 12RW
Ext Tube (EF25 MkI) is 25R The R & W refer to Red & White dots on tubes)
Using the above in various combinations is as follows:-
C + 12R gives 12mm with EF lenses
C + 25R gives 25mm with EF lenses
C + 12R + 25R gives 37mm with EF lenses
C + 12RW gives 12mm with EF & EFS lenses
C + 12R +12RW gives 24mm with EF & EFS lenses
C + 25R +12RW gives 37mm with EF & EFS lenses.
Have I gone wrong anywhere over this arrangement that makes it unnecessary to buy a new 25mm tube?
Hopefully no bad reactions.
Regards
Myrddin Jones
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